Launch the utility (Sentinel RMS tool) on the server or a client machine.
If you checked out a temporary standalone license for offsite work, it may be expired or locked. Open the tool. Search for your specific Hysys feature token. Click Check In to return the token to the server pool. Attempt to run Hysys while connected to the local network. Clean Residual Lock Files
“License Checkout Failed”虽然令人沮丧，但它也是一个逻辑严密的错误。通过本文提供的结构化排查指南，希望您已经能够理解错误的性质，并熟练地运用多种方法独立解决问题。无论是单机许可文件的小故障，还是企业级网络许可的大问题，只要按照从简单到复杂、从本地到网络的顺序进行诊断，大多数问题都能迎刃而解。
: Your computer cannot reach the license server. Aspen Hysys License Checkout Failed
If the error message specifies "All licenses are in use," the solution is administrative:
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Go to > Properties > Advanced System Settings > Environment Variables . Launch the utility (Sentinel RMS tool) on the
Set to your computer name (or the IP address/name of your license server). Restart HYSYS to check if the connection is established. Method 2: Verify License Availability (SLM Configuration)
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All available licenses are currently in use by others. Search for your specific Hysys feature token
Follow these steps in sequential order, moving from the most basic client-side checks to advanced network and server-level administration fixes. Step 1: Verify License Availability via SLM Tools
If the error specifically mentions that licenses are in use, it is likely a token/seat capacity issue.
The system variables on your local machine point to the wrong server name or port.
Sometimes, Hysys crashes, but the license server believes the session is still active. This hoards a token unnecessarily.